Tumblr SEO tips that work?

I'm trying to refine a tumblr blog of mine for SEO I'm kinda new to tumblr so I really don't know the ins and outs of it or what works or doesn't. I have read a lot of tips online to do with tumblr whether it be for on page SEO stuff or ranking tactics but I really am not sure what is right or wrong. Does anyone have any experience with Tumblr and have some tips to help me out with to help rank my tumblr blog better?

I have seen 2 -3 post regarding Tumblr. Use Search button. I am not able to post links

1. Set custom posts URLs
2. Optimise your page titles
3. Make your post titles h1's
4. Make your post titles permalinks to the post.
5. Link to yourself in the footer
6. XML sitemaps
7. Use heading tags in your posts
8. Add image alt tags
9. Consider making photo posts "text" posts

Make as many relevant #tags as possible and follow those in the same niche and like their page

Does anyone know how to correctly change tumblr post titles to h1 instead of h2? guides online say[FONT=Myriad Pro, Trebuchet MS, Helvetica, Arial, sans-serif] [/FONT]Look for the {block:Text} area and modify the <div class="title"> to <h1> to look like {block:Title}<h1>{Title}</h1>{/block:Title}" But when I change the h2s to h1 to look like this, my post title turns into a smaller text clickable link. Is that how it should look? Or is the style just messed up?